[llvm-bugs] [Bug 37193] New: [llvm-exegesis] Support latency mode for targets without a sheduler model

via llvm-bugs llvm-bugs at lists.llvm.org
Sat Apr 21 06:10:02 PDT 2018


            Bug ID: 37193
           Summary: [llvm-exegesis] Support latency mode for targets
                    without a sheduler model
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: andrea.dibiagio at gmail.com, clement.courbet at gmail.com,
                    craig.topper at gmail.com, filcab at gmail.com,
                    gchatelet at google.com, greg.bedwell at sony.com,
                    llvm-bugs at lists.llvm.org

We should be able to get at least an approximate latency value for targets
where we don't have pfm cycle counter support.

This should help speed creation of new scheduler models.

Note: On x86 we should try to use rdtscp instead of the default
__builtin_readcyclecounter() to enforce serialization of the timings.

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